package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消息的消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //kafka的配置
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9093,192.168.200.130:9094");
        //消息的key和vlaue的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //配置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group-02");
        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,"false");

        //kafka消费者对象
        KafkaConsumer<String,String> consumer = new KafkaConsumer<String, String>(properties);

        //订阅主题
        consumer.subscribe(Collections.singletonList("hello-topic"));

        while (true){
            //拉取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofSeconds(1));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.partition());
                System.out.println(consumerRecord.offset());

               /* try {
                    consumer.commitSync();//同步提交当前最新的偏移量
                }catch (CommitFailedException e){
                    System.out.println("记录提交失败的异常："+e);
                }*/

                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if(e!=null){
                            System.out.println("记录错误的提交偏移量："+ map+",异常信息"+e);
                        }
                    }
                });
            }
        }

    }
}
